A  January,  1913™'}  Digitalis  Glucosides  and  Allied  Drugs.  41 
and  not  in  petroleum  benzin  (aether  petrolei).  The  error 
of  the  French  Pharmacopoeia,  therefore,  is  due  to  the  faulty 
misleading  translation  of  the  German  "  Benzin  "  into  "  benzine,' 
which  in  French  is  equivalent  to  benzol. 
Digitoxinic  acid,  C34  H56  012,  occurs  in  the  form  of  the  sodium  salt 
on  heating  digitoxin  with  alcoholic  caustic  soda.  (Kiliani, 
Archiv  der  Pharmazie  1899,  P-  4-66. — Berichte  der  deutschen 
chemischen  Gesellschaft  Berlin  1899,  p.  2200.) 
Digitoxonic  acid,  C6  H12  Os,  is  obtained  by  the  oxidation  of 
digitoxose.  (Berichte  der  deutschen  chemischen  Gesellschaft 
Berlin  1905,  p.  4040,  1908,  p.  656  and  1909,  p.  2610.) 
Digitoxose,  C6  H12  04,  is  the  sugar  formed  together  with  digi- 
toxigenin  in  the  hydrolysis  of  digitoxin.  White  crystals  melt- 
ing at  1010  C.  (Kiliani,  Archiv  der  Pharmazie  1895,  p.  311 
and  1896,  p.  486. — Berichte  der  deutschen  chemischen  Gesell- 
schaft Berlin  1898,  p.  2455;  1899,  p.  2196;  1905,  p.  4040.) 
Digitsaponin  is  a  designation  suggested  by  Kraft  for  digitonin 
Schmiedeberg.  (Schweizer  Wochenschrift  fur  Chemie  und 
Pharmazie.    191 1,  p.  175.) 
Digitic  acid  is  obtained  from  digitogenic  acid  by  oxidation  with 
potassium  permanganate.  It  crystallises  in  needles  melting  at 
1920  C.,  and,  according  to  Kiliani,  it  has  the  formula 
C20  H  32  08.  (Kiliani,  Berichte  der  deutschen  chemischen 
Gesellschaft  Berlin  1891,  p.  346,  and  1899,  p.  339. — Archiv 
der  pharmazie  1893,  P-  448-) 
Digic  acid,  C16  H24  Oe,  is  an  amorphous  acid,  which  can  be  obtained 
by  oxidation  of  the  mother-lye  of  digitic  acid.  (Kiliani, 
Archiv  der  Pharmazie  1894,  p.  334.) 
Dixgeninic  acid,  C22  H?4  05,  is  obtained  in  the  form  of  needle 
shaped  crystals,  melting  at  225 0  C.,  by  heating  digitoxigenin 
with  alcoholic  solution  of  caustic  soda.  (Kiliani,  Berichte 
der  deutschen  chemischen  Gesellschaft  Berlin  1899,  p.  2198.) 
Gitalin  is  a  glucoside  which  was  obtained  by  Kraft  from  digitalis 
leaves  (compare  p.  31)  ;  it  is  soluble  in  600  parts  of  cold 
water.  According  to  Schmiedeberg,  it  corresponds  in  strength 
in  its  physiological  action  to  digitalinum  verum.  (Schweizer 
Wochenschrift  fur  Chemie  und  Pharmazie  191 1,  p.  163.) 
Gitalin  hydrate  is,  according  to  Kraft,  obtained  from  gitalin  by 
dissolving  the  latter  in  iy2  parts  of  alcohol  at  ordinary  tem- 
perature and  adding  %  of  a  part  of  water.    It  separates  in 
